We get them out here.
Here's a white birch with the holes - Attached below
We also get Acorn woodpeckers - those are more restricted to deadwood, and they seem to prefer working up higher with their acorns.
Also attached and here - it decided it liked the bird feeder too.
Seems that your tree - if a sweet gum - may have evidence of more than just sapsuckers. Sapsuckers yes. Other, not sure. Could be just the one bird.